<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
  <div id="app">
    <mycomponent></mycomponent>
  </div>
  <script>
    //扩展构造器
    var constructor = Vue.extend({
      template: `<div><p>
        <h2 @click='handleClick'>{{content}}</h2>
      </p></div>`,
      data() {
        return { content: 'hello h2' }
      },
      methods: {
        handleClick() {
          this.content = "hello vue"
        }
      }
    })
    //全局组件
    Vue.component('mycomponent', constructor)
    //根组件
    var app = new Vue({
      el: '#app',
    })
  </script>
</body>

</html>